Efficiency Jamming And Anti-jamming Method For Digital Modulation

Wireless communication systems are vulnerable to jamming attacks because of its inherent openness.It is relatively common in electromagnetic spectrum management and communication transmission.This paper mainly studies the efficiency jamming for digital modulation and the effective anti-jamming method for such efficient jamming attacks in the context of communication transmission.The research objects of this paper are BPSK,QPSK,QAM and OFDM signal Especially study on the efficiency jamming waveform of the modulated signal and the effective anti-jamming against efficiency jamming in the AWGN channel method.In this paper,the mathematical model of the above signals without jamming and correlated jamming is established.By deriving the BER formula and using the theoretical analysis method of convex optimization,the efficiency jamming for the above different types of signals is obtained.Style and analyze the effective anti-jamming methods that exist when the efficiency jamming attack is applied.In this paper,based on the theoretical derivation of the efficiency jamming pattern,MATLAB is used to simulate and verify its jamming effect and interference gain.The details are as follows:First,this paper analyzes the efficiency jamming pattern for communication signals with different modulation methods.Taking BPSK,QPSK,and 16 QAM as examples,the bit error rate formula under the AWGN channel and when there is relevant jamming is derived.Then,taking 16 QAM signal as an example,according to the derived 16 QAM signal error rate formula,this paper constructs the objective function of the jamming signal distribution,and analyzes it using the convex optimization method to obtain the optimal maximum error rate for 16 QAM signal.The jamming waveform is then extended to other modulation communication signals to obtain the efficiency jamming pattern for different modulation communication signals.And on the basis of the above-mentioned derivation,the application is extended,and the efficiency jamming waveforms of some commonly used communication modulation signals are obtained and the simulation analysis is given.Later,this paper also studies the efficiency jamming waveform of OFDM signal.The overall modulation process and the transceiver model of the OFDM system are summarized,and the bit error rate model of the OFDM signal is established.According to the above model,the efficiency jamming waveforms for different modulation modes of OFDM signal are obtained,and the simulation results are given.Finally,under the model of applying the above-mentioned "efficiency jamming" to the communication signal,for single-carrier signals and frequency division multiplexed signals,considering the bandwidth limitation in the actual situation,in-band spread spectrum is used for the communication signal And the method of reducing the modulation order,the theoretical analysis and simulation verification of the signal antijamming effect.